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Using Geographic Methods to Understand Health Issues

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Figure 4. Construction of a Demographic Base Map

Description for figure given below

A demographic base map (DBM) employs a grid to construct a map based on population rather than land area (the basis for most maps). An area may be quite prominent on an areal map, but if it is sparsely populated it will be less prominent on a DBM.

Data Source: U.S. Census of Population, 1990.

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